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LMX2592EVM: Spur on all channels on EVM.

Part Number: LMX2582EVM
Other Parts Discussed in Thread: USB2ANY, LMX2592EVM

I'm running an LMX2582EVM around 5.2 GHz and seeing a 4.2 MHz spur on all channels despite the charge pump setting, external power supplies, even if the Num/Div dividers are set to an integer channel, disconnecting the USB2ANY the spur is there.  The modified loop filter components are a passive second order with C1=3.3nF, C2=100nF, R2=680ohms.  I can send the register dump in an email about this setup.  Anyone have any other ideas what is causing this or seen this spur?